A non-transitory computer-readable medium stores computer-readable instructions, the computer-readable instructions, in response to being activated by an operating system, causing the portable terminal to perform: a first acceptance process of accepting an operation designating one of image forming devices communicable; a first storage process of causing the memory to store a first device ID, as a designated device ID; a second acceptance process of accepting an operation designating contents; and an operation instruction process of transmitting operation instruction information, and the computer-readable instructions, in response to being activated by another program, causing the portable terminal to perform: an acquisition process of acquiring, from the another program, a second device ID for identifying the image forming device; and a second storage process of causing the memory to store the second device ID, as the designated device ID.